/**
*      author: Y_Yao
*      created: 2025-03-20 20:53:01
**/

#include<bits/stdc++.h>

#define int LL
using namespace std;
using LL = long long;
const LL LLINF = 9e18;
const int INF = 0x3f3f3f3f;
const int N = 1e11 + 7;
int n;

void solve()
{
    cin >> n;
    int ans = 0;
    for(int a = 1;a*a*a <= n;a++)
    {
        for(int b = a;b*b*a <= n;b++)
        {
            ans += n / a / b - b + 1;
        }
    }
    cout << ans << endl;
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int t = 1;
    //cin >> t;
    while(t--)
    {
        solve();
    }
    return 0;
}